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US 5,329,195 AGranted
Sensor motor
AssigneeSeiberco Incorporated
InventorsRalph W. Horber, Hung D. Vu
Life of this patent
Estimating the term…
Abstract
A polyphase brushless DC motor has an integral automatic feedback arrangement affording excellent accuracy and a high degree of magnetic balance. The stator pole elements of the motor are identical and equidistantly spaced, and each is wound with two coils. One coil on each pole element comprises sensor circuitry; the other comprises power circuitry. As a result, all pole elements of the stator are utilized both to produce rotor drive torque and also to generate electrical signals that provide highly accurate rotor-position information.
Claims18
In a polyphase, direct current electric motor or the like, the combination comprising:
- a stator o f magnetic material comprising a generally cylindrical body portion and a multiplicity of at least eight identical pole elements extending radially from said body portion at locations spaced thereabout, and a sensor coil and a phase coil wound about each of said pole elements, said sensor coils being arranged as equal-number sets of at least four series-connected coils, with said coils of a first set being wound on a first set of associated pole elements and said coils of a second set being wound on a second set of associated pole elements, said pole elements of sad first and second sets alternating in positions about said body portion of said stator, each of said sets of stator coils and associated pole elements being subdivided into equal-number subsets of at least two coils and pole elements;
- sensor means having at least two electrical circuit legs, one of said circuit legs being connected to said first set of coils, at a first junction between said subsets thereof, and the other of said two circuit legs being connected to said second set of coils, at a second junction between said subsets thereof, said first and second sets of coils adapting said associated pole elements to function as sensor pole elements, providing at least two sensor channels for the generation of signals indicative of angular orientation of a rotor assembled with said stator, said signals constituting averaged values of electrical effects produced simultaneously upon a plurality of pole elements;
- and power supply means connected to said phase coils for providing at least two phases of current, said supply means having one circuit portion connecting a first group of said phase coils wound about a first group of said pole elements in series for energization by one phase of current, and having another circuit portion connecting a second group of said phase coils wound about a second group of said pole elements in series for energization by a second phase of current, said one and another circuit portions of said supply means, so connected, adapting said pole elements to function as first and second phase torque pole elements, respectively, the total number of sad pole elements on said body portion divided by the number of phases provided by said power supply means being an even number.
In a polyphase, direct current electric motor or the like, the combination comprising:
- a stator of magnetic magerial comprising a body portion and a multiplicity of at least eight identical pole elements extending outwardly from said body portion at spaced locations, and a sensor coil and a phase coil wound about each of said pole elements, said sensor coils being arranged as equal-number sets of at least four series-connected coils, with said coils of a first set being wound on a first set of associated pole elements and said coils of a second set being wound on a second set of associated pole elements, said pole elements of aid first and second sets alternating in positions along said body portion of said stator, each of said sets of coils and associated pole elements being subdivided into equal-number subsets of at least two stator coils and pole elements, said pole elements of one of said subsets of each set alternating, in positions about said body portion of said stator, with said pole elements of the other subset of the same set;
- sensor means having at least two electrical circuit legs, one of aid circuit legs being connected to said first set of coils, at a first junction between said subsets thereof, and the other of said two circuit legs being connected to said second set of coils, at a second junction between said subsets thereof, said first and second sets of coils adapting said associated pole elements to function as sensor pole elements, providing at least two sensor channels for the generation of signals indicative of the position of a rotor assembled with said stator, said signals constituting averaged values of electrical effects produced simultaneously upon a plurality of pole elements;
- and power supply means connected to said phase coils for providing at least two phases of current, said supply means having one circuit portion connecting a first group of said phase coils wound about a first group of said pole elements in series for energization by one phase of current, and having another circuit portion connecting a second group of said phase coils wound about a second group of said pole elements in series for energization by a second phase of current, said one and another circuit portions of said supply means, so connected, adapting said pole elements to function as first and second phase force-generating pole elements, respectively, the total number of said pole elements on said body portion divided by the number of phases provided by said power supply means being an even number.
Dependencies are inferred from the claim text.